Microstructures and strength of microporous MgO-Mg(Al, Fe)2O4 refractory aggregates

作者：Chen, Qianlin; Yan, Wen^*; Schaffoener, Stefan; Wu, Han; Han, Bingqiang; Zhang, Jinhua; Li, Yawei

来源：Journal of the European Ceramic Society, 2023, 43(6): 2654-2662.

DOI：10.1016/j.jeurceramsoc.2023.01.023

• Microporous refractory aggregates
• MgO-Mg(Al
• In-situ decomposition synthesis method
• Microstructures
• Strength

Microporous MgO-Mg(Al, Fe)2O4 refractory aggregates were prepared using magnesite, Al(OH)3 and Fe2O3 applying an in-situ decomposition synthesis method. At 1400-1600 degrees C, there was a Mg(Al, Fe)2O4 with Fe3+, which had two structures. One was a ring structure formed from Al(OH)3 pseudomorph particle as a template and a low content of Fe3+. The other was the dot and strip structures precipitated in magnesite pseudomorph particles with a high content of Fe3+. Besides, at 1550-1600 degrees C, microporous MgO-Mg(Al, Fe)2O4 refractory aggregates had an excellent compressive strength (75.8-81.5 MPa) and apparent porosity (26.8%_ 28.2%).